Letter, dated November 13, 1935 to Mr. Eric Zachau from J. O. Matteson relating the improvement of the water in the radiator of his vehicle. Letter has printed letterhead of The Brunswick-Balke-Collender Co. At the centre is an eagle with outstretched wings and rays all around it. Printed across the centre is 'Monarch Cushion'.sciences, instruments - general, scalebuoy, bill ashman collection - correspondence, the brunswick-balke-collender co michigan, eric zachau, j o matteson